JP2020073777A - Construction machine - Google Patents

Abstract

To provide a construction machine having a guard body which can sufficiently fulfill a protective function for a driver against a flying object from the front, and which can be post-fitted to a construction machine of a two-pole canopy specification and can sufficiently fulfill a protective function for the driver against a falling object on the canopy and against tip-over of a machine body.SOLUTION: A construction machine comprises: a floor part; a canopy covering an upper part of a driving section disposed on the floor part; and a guard body connecting the floor part to the canopy. The guard body includes a pair of right and left main frames extending in a vertical direction. The canopy comprises: a canopy roof; and a support body which is bridged between two posts erected at a rear part of the driving section, which supports the canopy roof from a lower part, and which is connected with an upper end portion of the main frame.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a guard body and a construction machine equipped with the guard body.

  Patent Documents 1 and 2 disclose a construction machine in which a guard body for protecting a driver is provided between a floor of the construction machine and a canopy that covers the upper side of a driving section arranged on the floor. It is disclosed. That is, in Patent Document 1, a guard body formed by stretching a metal net body on a frame body having a large window is provided between the floor portion and the front end portion of the canopy in front of the driving section. Disclosed structures are disclosed. Further, in Patent Document 2, a guard body formed of a protective plate that allows a driver seated in a driver's seat to visually recognize the front and a protective frame that surrounds an outer peripheral edge of the protective plate is provided in front of the driver with a floor. The structure interposed between the front end of the canopy is disclosed. When the dismantling work or the like is performed, the guard body protects the driver of the driving unit from scattered objects.

JP, 2007-154477, A Japanese Patent No. 5071298

  However, although these guards are configured to protect the driver from scattered objects from the front, the rigidity of the connection with the canopy is inadequate, so that the objects that fall onto the canopy or There is a problem that the driver's protection function against the rollover of the aircraft is not sufficiently fulfilled.

  Therefore, the present invention not only has a function of protecting the driver from scattered matter from the front, but can also be retrofitted to a construction machine with a two-column canopy specification to protect the driver from falling objects to the canopy and overturning of the machine body. An object of the present invention is to provide a guard body that can be sufficiently fulfilled and a construction machine equipped with the guard body.

According to the first aspect of the present invention,
A guard body that is removably interposed between the floor of the construction machine and a canopy that covers the upper part of the operating section disposed on the floor,
The guard body has a pair of left and right main frames extending in the vertical direction,
On the upper end of the main frame, a horizontal connecting end connected to the strength member forming a part of the canopy in a vertically overlapping state is formed by bending backward,
At the lower end of the main frame, a butt joint is formed on the floor so as to butt-join the floor from above.

A second aspect of the present invention is the invention according to the first aspect,
The guard body includes a pair of left and right main frames, a pair of subframes that are horizontally bridged between the upper and lower portions of both main frames, and a plurality of vertical rails that are installed between the subframes at intervals in the left-right direction. It is characterized in that it is formed as a strong member.

A third aspect of the present invention is an invention according to the second aspect,
The guard body includes a plate-shaped rear light-transmissive guard piece that is arranged in a front-to-back opposed state behind a vertical rail,
The driver seated on the driver's seat is characterized by being able to visually recognize the front through the space between the rear guard piece and the vertical rail.

A fourth aspect of the present invention is an invention according to the third aspect,
The rear guard pieces are attached to a plurality of vertical rails via the mounting seats, and are stretched at regular intervals with respect to the vertical rails to form a space that is open to the top, bottom, left, and right sides. It is characterized by

  A fifth aspect of the present invention is a construction machine, which is equipped with the guard body according to any one of the first to fourth aspects.

  According to the present invention, in addition to the function of protecting the driver from scattered objects from the front, the driver can be retrofitted to a construction machine with a two-column canopy specification and has a function of protecting the driver from falling objects to the canopy and overturning of the aircraft. It is possible to provide a guard body that can be sufficiently fulfilled and a construction machine equipped with the guard body.

The left side view of the excavation work vehicle which concerns on this embodiment. The perspective view from the left front of the excavation work vehicle concerning this embodiment. The perspective view from the left rear of the excavation work vehicle concerning this embodiment. Exploded attachment explanatory drawing of a guard body and a canopy roof. The perspective view from the lower left side of the canopy. FIG. 6 is a sectional view taken along line I-I of FIG. 5. The front view of a guard body. Rear view of the guard body. Right side view of the guard body. Left side view of the guard body. The top view of a guard body. The bottom view of a guard body. The perspective view from the left front of a guard body. The perspective view from the right back of a guard body. II-II sectional view taken on the line of FIG. III-III sectional view taken on the line of FIG.

  Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 is an excavation work vehicle as a two-column canopy specification construction machine according to the present invention. The excavation work vehicle A is a guard that protects a driver from the front side (front). Body B is detachably equipped so that it can be retrofitted.

[Overview of the entire excavation work vehicle]
As shown in FIGS. 1 to 3, the excavation work vehicle A includes a traveling vehicle body 1 capable of self-propelling, an excavation section 2 as a working section attached to the traveling vehicle body 1, and an earth discharging section 3. .. In the present embodiment, a bucket 13 for excavation is detachably attached as a work attachment to the tip of the work section to form the excavation section 2. Instead of the bucket 13, a rock drilling device, a crushing device, or the like as a work attachment is properly attached to the tip of the work part so that various works can be performed.

  In the traveling vehicle body 1, a base 5 is provided between a pair of left and right crawler type traveling parts 4, 4 and a swivel base 6 is mounted on the base 5 so that the swivel base 6 can be swiveled in any of left and right directions around a vertical axis. It is installed. The swivel base 6 is a schematic plan view capable of turning within a small turning radius of the left and right widths of the traveling parts 4, 4 (the distance between the outer edge of the left traveling part 4 and the outer edge of the right traveling part 4). It is formed in a disc shape to enable small turning work. On the swivel base 6, the operating part 7 is arranged on the floor part 30 formed in the left front half part thereof, and the tank part 8 is arranged adjacent to the right side of the operating part 7 so that the swivel can be performed. A prime mover section 9 is arranged in the latter half of the table 6. The operating unit 7 is arranged on the swivel base 6. At the center of the front end of the swivel base 6, the base end of the excavation unit 2 is pivotally supported and attached. The earth discharging part 3 is attached to the base 5 between the pair of left and right running parts 4, 4. A canopy 10 is erected on the prime mover section 9, and the canopy 10 covers the area directly above the operating section 7.

  The excavation unit 2 includes a boom 11, an arm 12, a bucket 13, a swing cylinder (not shown) for rotating these, a boom cylinder 15, an arm cylinder 16, and a bucket cylinder 17.

  As shown in FIGS. 1 to 3, the earth unloading unit 3 is capable of moving up and down the base end portions of the pair of left and right blade arms 26, 26 extending in the front-rear direction on the base 5 between the pair of left and right running units 4. A blade (earth-discharging plate) 27 extending in the left-right direction is installed between the tip ends of the two blade arms 26, 26 attached. The blade 27 is formed to have substantially the same width as the left and right sides of the running portions 4, 4. 28 is a blade cylinder.

  With such a configuration, the traveling vehicle body 1 can appropriately perform forward / backward straight traveling and left / right turning traveling by operating the traveling portion 4 with the driving portion 7. Then, the excavation section 2 is operated by the operation section 7 so that excavation work can be performed. Further, the soil discharging work can be performed by operating the soil discharging unit 3 by the operation unit 7.

(Explanation of the structure of the driving unit)
As shown in FIG. 1 and FIG. 2, the driving unit 7 has a pair of left and right traveling levers 90 and 91 provided upright on the front portion of the floor 30 and tilting the traveling levers 90 and 91 in the front-rear direction. The traveling vehicle body 1 can be operated for traveling. A driver's seat 93 is placed on the rear of the floor 30 via a driver's seat support base 92. Left and right work operation levers 94 and 95 for operating the work units (excavation unit 2 and earth removal unit 3) are provided on the left and right sides of the driver's seat 93. An operation panel portion 96 is arranged on the right side of the right work operation lever 95.

  In the thus configured driver 7, the driver seated in the driver's seat 93 operates the traveling levers 90, 91 and the left / right work operation levers 94, 95 while viewing the front, and the driver operates as desired. I am ready to work.

(Explanation of the structure of the canopy)
Next, the configuration of the canopy 10 will be described with reference to FIGS. That is, the canopy 10 includes a pair of left and right columns 31 and 32 standing upright on the prime mover section 9, a horizontal bridging piece 33 extending horizontally between the upper portions of the columns 31 and 32, and upper and lower portions of the columns 31 and 32. A plate-like support 34, which is a strength member having a rear part attached to a midway part of the frame 33 and a front part projecting forward in a horizontal cantilever shape, and a canopy roof attached to the plate-like support 34 from above in a covering shape. And 35. The canopy roof 35 covers immediately above the driver 7.

  The plate-shaped support 34 is a rigid plate-shaped support book piece 36 formed in a longitudinally long rectangular plate shape in the front-rear direction, and left and right connection integrally formed on the left and right side edges of the support book piece 36 so as to project outward. A reinforcing member is formed from the pair of front and rear reinforcing pieces 39, 40 that are formed by extending the left and right connecting pieces 37, 38 in the left-right direction between the pieces 37, 38, and are formed continuously on the lower surface of the supporting book piece 36. Is forming. The rear end edge portion of the support book piece 36 is welded to the midway portion of the horizontal bridge piece 33 so as to be continuously provided. The rear portions of the left and right connecting pieces 37 and 38 are welded to the upper ends of the columns 31 and 32 in a penetrating manner to be continuously provided. The left and right connecting pieces 37, 38 are formed with a plurality of (three in this embodiment) connecting holes 41, 42 opening in the up-down direction at intervals in the front-rear direction. The connecting bolts 43, 44 are inserted into the connecting holes 41, 42 from below, and the connecting bolts 43, 44 are screwed into the female screw portions 45, 46 provided on the lower surface of the canopy roof 35, thereby forming a plate shape. A canopy roof 35 is connected to the support 34.

[Explanation of the structure of the guard body]
Next, the configuration of the guard body B will be described with reference to FIGS. That is, the guard body B is detachably provided between the floor 30 and the canopy 10 to cover the front of the driver who sits on the driver's seat of the driver 7 and operates. Here, the guard body B is formed so that a seated driver having a normal figure (for example, height 170 cm, weight 65 kg) can fit within the projected area from the front, and scatters from the front. The driver B is designed to protect the driver from scattered objects.

  The guard body B is arranged in a front-rear facing manner behind the front guard piece 50 having a plurality of first and second vertical rails 57 and 58, which will be described later, and behind the plurality of first and second vertical rails 57 and 58. The rear guard piece 80 is plate-shaped and has a light-transmitting property. Then, the driver seated in the driving unit 7 sees the front through the transparent rear guard piece 80 and also through the first vertical rails 57, 57 or the second vertical rails 58, 58 of the front guard piece 50. It is possible.

(Explanation of the front guard piece)
The front guard piece 50 includes a pair of left and right main frames 51 and 52 extending in the vertical direction, a first upper and lower sub-frames 53 and 54 extending horizontally between the upper portions of the main frames 51 and 52, and both main frames 51. The second upper / lower sub-frames 55, 56 which are laterally bridged between the lower parts of the first and second upper / lower sub-frames 53 to 56, and a plurality of first upper / lower sub-frames 53 to 56 which are erected at right and left intervals The second vertical rails 57 and 58 are provided.

  More specifically, the pair of left and right main frames 51, 52 are formed in a circular pipe shape extending in the vertical direction, and each main frame 51, 52 is formed by linearly extending in the vertical direction. Horizontal connection in which the intermediate portions 51a and 52a and the strength members that form a part of the canopy 10 are vertically overlapped with each other and are formed by bending backward from the upper ends of the intermediate portions 51a and 52a and extending backward. Formed integrally from the end portions 51b and 52b, and the butt joint portions 51c and 52c that are linearly extended from the lower end portions of the intermediate portions 51a and 52a toward the rear lower side and are coupled to the floor portion 30 from above in a butt state. is doing.

  A first upper sub-frame 53 formed in a straight pipe shape extending in the left-right direction is horizontally provided between the upper portions of the intermediate portions 51a, 52a, while a straight pipe shape extending in the left-right direction is formed between the intermediate portions. The first lower sub-frame 54 is horizontally mounted. Between the pair of upper and lower first upper and lower sub-frames 53, 54, a plurality of (7 in the present embodiment) first vertical bars 57 formed in the shape of a straight bar extending in the vertical direction are fixed in the horizontal direction. They are installed at intervals. In addition, in the middle portions 51a and 52a, a second upper sub-frame 55 formed in a straight pipe shape that extends in the left-right direction is laterally bridged between the intermediate portions, while a straight pipe shape that extends in the left-right direction between the lower portions. The second lower sub-frame 56 formed in the above is horizontally mounted. Between the pair of upper and lower second upper and lower sub-frames 55, 56, a plurality of (7 in the present embodiment) second vertical bars 58 formed in the shape of a straight rod extending in the vertical direction are fixed in the horizontal direction. They are installed at intervals. Here, the first lower sub-frame 54 and the second upper sub-frame 55 are arranged close to each other in the vertical direction.

  On the rear upper portion of the horizontal connecting ends 51b, 52b, there are welded overlapping connecting pieces 60, 61 formed in a longitudinal plate shape in the front-rear direction with their surfaces oriented in the vertical direction. A plurality of (two in the present embodiment) canopy connecting holes 62, 63 that open in the vertical direction are formed. A plurality of overlapping connecting pieces 60, 61 are formed on the left and right connecting pieces 37, 38 of the plate-like support 34 from below and are formed on the left and right connecting pieces 37, 38 (two pieces in this embodiment). Aligning the canopy connecting holes 62, 63 with the connecting holes 41, 42, and tightening them together with the connecting bolts 43, 44 in a superposed state in which the respective connecting pieces 37, 38 and the respective superposing connecting pieces 60, 61 are in surface contact. The upper end of the guard body B is connected to the canopy 10 so that it can be retrofitted.

  At the lower ends of the butt joint portions 51c, 52c, butt joint pieces 64, 65 formed in a laterally long plate shape in the left-right direction are welded with their surfaces oriented in the up-down direction. The floor connecting holes 66 and 67 are formed with the axis directed toward. The butt connecting pieces 64, 65 are connected to the floor 30 in a butt state from above by the floor connecting bolts 68, 69 via the floor connecting holes 66, 67. A shielding plate 70 formed in the shape of a horizontally long rectangular plate is installed between the butt joints 51c and 52c, and between the butt joints 51c and 52c, that is, the foot of the driver in the driver 7 is excavated from the excavator 2. It is shielded.

  The front guard piece 50 configured as described above connects the horizontal connecting ends 51b and 52b of the main frames 51 and 52 to the plate-shaped support 34 of the canopy 10, while the floor portion 30 is connected to the horizontal connecting ends 51b and 52b of the main frames 51 and 52. By connecting the butt joint portions 51c and 52c, a roll bar as a strength member that protects the front, upper, and rear of the driver seated in the driver's seat of the driver 7 is formed in cooperation with the canopy 10. To do. Therefore, the front and rear guard pieces 50, 80 protect the driver against scattered objects from the front, and the canopy 10 protects the driver against falling objects from above, and the excavation work vehicle. When A falls, etc., the front guard piece 50 and the canopy 10 that cooperate to form a roll bar as a strength member protect the driver.

(Explanation of the rear guard piece)
The rear guard piece 80 has a first mounting seat 81 protruding rearward from each of the plurality of first vertical rails 57, and a plate-shaped first rear guard piece 82 formed on the rear end surface of the first mounting seat 81. Are abutted from behind and attached by the first bolts and nuts 83. That is, the first rear guard piece 82 is stretched over the first vertical rail 57 with a certain distance in the front-rear direction. By doing so, the first space S1 that is open in the upper, lower, left, and right sides is formed. 87 is a front side cushioning mat, 88 is a rear side cushioning mat, and 89 is a washer. The front side cushioning mat 87 is interposed between the rear side of the first mounting seat 81 and the front side of the first rear guard piece 82. On the other hand, the rear surface side cushioning mat 88 is interposed between the rear surface of the first rear portion guard piece 82 and the washer 89 to protect the mounting portion of the first rear portion guard piece 82 by these cushioning functions.

  Further, the rear guard piece 80 has a second mounting seat 84 projecting rearward from each of the plurality of second vertical rails 58, and a plate-shaped second rear guard formed on the rear end surface of the second mounting seat 84. The piece 85 is abutted from the back and attached by the second bolt and nut 86. That is, the second rear guard piece 85 is stretched between the second vertical rail 58 and the second vertical rail 58 with a certain distance in the front-rear direction. By doing so, the second space S2 that is open at the top, bottom, left, and right sides is formed. The front side cushioning mat 87 is interposed between the rear surface portion of the second mounting seat 84 and the front surface of the second rear guard piece 85, while between the rear surface of the second rear guard piece 85 and the washer 89. The rear side cushioning mat 88 is interposed, and the mounting portion of the second rear guard piece 85 is protected by these cushioning functions.

  The rear guard piece 80 includes first and second rear guard pieces so that a seated driver having a normal body shape (for example, height 170 cm, weight 65 kg) can fit within the projected area from the front (front) thereof. The size of 82, 85 and the height of the arrangement from the floor 30 are set so that the driver is protected by the front guard piece 50 and the rear guard piece 80 from the scattered objects scattered from the front. ..

  The first and second rear guard pieces 82, 85 can be formed into a flat plate shape using transparent safety glass, for example, polycarbonate which is organic glass. Polycarbonate has high physical properties in terms of transparency, impact resistance, heat resistance, flame retardancy and dimensional stability.

  Although the first and second rear guard pieces 82 and 85 have excellent impact resistance, they are protected by the first and second vertical rails 57 and 58 so as not to directly collide with large scattered objects. The vertical rails 57, 57 adjacent to each other in the left-right direction of the first and second vertical rails 57, 58 and the space between the vertical rails 58, 58 have a normal body shape (for example, height 170 cm, weight 65 kg) It is formed so that the palm of the person can be inserted. The inserted palm allows the front surfaces of the first and second rear guard pieces 82, 85 to be wiped clean with a rag or the like, so that the transparency of each of the rear guard pieces 82, 85 can be secured well. . At this time, the first and second spaces S1 and S2 secure a space in which the worker can freely move his / her wrist in each of the spaces S1 and S2. I am able to do it.

A excavation work vehicle B guard body 7 driving part 10 canopy 30 floor 51 left main frame 52 right main frame 51b left horizontal connecting end 52b right horizontal connecting end 51c left butt connecting part 52c right butt connecting Department

Claims (3)

A construction machine comprising a floor portion, a canopy covering an upper portion of an operating portion arranged on the floor portion, and a guard body connecting the floor portion and the canopy,
The guard body has a pair of left and right main frames extending in the vertical direction,
The canopy includes a canopy roof and a support member that is installed between two columns that are erected upright in the rear of the driving unit, supports the canopy roof from below, and is connected to an upper end portion of the main frame. A construction machine characterized by being provided.   The support is a plate-like support that projects horizontally forward in a cantilevered manner, and the portion of the support that is connected to the upper end of the main frame is located outside the left and right edges of the support. The construction machine according to claim 1, wherein the left and right connecting pieces are integrally formed in a protruding shape.   The construction machine according to claim 1 or 2, wherein a connection portion that is connected to the floor portion is formed at a lower end portion of the main frame.

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